Virgin Media outgoing SMTP mail server error

[DeLorean]

Since mid-afternoon on the 25th June Outlook has been unable to send e-mail through Virgin Media's outgoing SMTP server for all of our virgin.net e-mail accounts.

We receive the error...

Task '*****.*******@virgin.net - Sending' reported error (0x800CCC78) : 'Cannot send the message. Verify the e-mail address in your account properties. The server responded: 530 5.1.0 Authentication Required (VM401)'

I have also been contacted by customers in Basingstoke who are also experiencing the same issue.

P.S. Incoming e-mails via POP3 are working fine.

Is anyone else experiencing this problem and is aware of what's going on?

[AstonUO]

That worked for me.

Thank you.

[Kitt-Cat]

I’m having the same problem with thunderbird. But I have no idea what’s going on or what to do. Hoping someone here can help and advise.

[Kitt-Cat]

Hi any idea how to do this in thunderbird. I’m really stressing about this. 

[Kitt-Cat]

Hi have you any idea how to sort this in thunderbird. Sorry, ( which a screen shot. ( I’m really struggling ))

[Kitt-Cat]

Hi how did you get your issue resolved. I’m really struggling 

[Kitt-Cat]

Hi how do you do this in thunderbird, any idea.

[Ayisha_B]

Hi @Kitt-Cat 

Sorry to hear you are having issues with your third party email client. 

Can you confirm everything is working via WebMail?

[Kitt-Cat]

Sadly not, I don’t know how to sort it 

[Legodude_uk]

I have set my App password and everything was working fine, then suddenly yesterday it stopped sending emails again! I have reset the app password in the Mail App on iOS and it still isn't working (Webmail is fine). I have also deleted the account from the Mail App and when setting it up again it said that the SMTP server wasn't responding!

[Legodude_uk]

Interestingly, just got home and connected to the home WiFi and the emails sent…